Examine source code of Feed holiday - Remove Feeds & Distracting Elements

{
  "manifest_version": 3,
  "name": "Feed Holiday",
  "version": "2.0.1",
  "description": "Hide or show Facebook, Reddit, LinkedIn, YouTube, and Hacker News feeds & other elements with toggle switches",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dont-feed-me@julien",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "gecko_android": {
        "strict_min_version": "142.0"
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.facebook.com/*",
    "*://*.reddit.com/*",
    "*://*.linkedin.com/*",
    "*://*.youtube.com/*",
    "*://news.ycombinator.com/*"
  ]
}